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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02c27ace9b981e9b85d2e0ea8a01182a6633ffe57508f937993c81e1d471f69' 
  AND token = 'WapyNrdp+gHTg0QrNfutCdf/jx9iRBfDirX44niiKp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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