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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca13ecda681eae143ae29b1d4692bb8e35242794c2d2fcf55a301c82825e4156' 
  AND token = 'm7JwM1WLSKT/LeJn2GplvczKxDoFvY1QpQ+iONHxtMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}