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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '723eedc35c58f91fb911de5fcef40413c762af9ee540ced8887a1b72dbc62c0d' 
  AND token = 'uWCCUkoSARLFYQt/B+SJNAVHuNcgmy9FDt/879Uh4yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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