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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cbf8bc8400081d6276182d3a4d07811c35611ab4c8fd93ed94e1bad5ae919ee' 
  AND token = 'cCqNk0b6aOP8Dy8tUluI3ZwpGUr9qcuPWH3Gy34iRSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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