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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ef2279379831d72dd4c67e4448d0cf8006a08e63bdff94eae4ee1abda1d692' 
  AND token = 'iM00ca4Tvmy8tRZYi9z2zZ+kTeT7zI81ruzFiJIEo8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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