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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0efbe591ef45aedb1d6aaecc8eb71b5c5968bf177f154f2c7511bc52edcd14c7' 
  AND token = 'UO6c70YOtHir0LH5DQJYX5cAgWQ9kvYYiQ1NG0Ep0j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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