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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da016ea31126134f885ec58822514cfab5aacb7fdcc492efb51672a851c2863' 
  AND token = '2rmIIl79zoJLc7QAvtLz4P9XURfu1t8Ca41SscAfRg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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