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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a53acbf5f61ded90c3e002710fb3e39673ade3e53381a7cf2b4b1149535742fc' 
  AND token = 'Rs8PIQKNAx9hnQQ6xUbScR/mQH6FpJTGO2ka4o5slRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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