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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e640c683aec40cf05e8990716d33d2443208521dec7ee9c2564e3ad960c6c42f' 
  AND token = 'Wyz7u7viKGCcj08GlChKzgRZrUXLP3yPABvAcVWvoOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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