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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f48875dc4f92b7c50bce69d7c4c873da2d353d6be94b88477863637f9b56f5' 
  AND token = 'a6TSJgjpMee9c35zNMfssh7z9vAyzGIT7PVEH988NC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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