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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1108ec22584ab6a0a85a23adce5848f05a73513f9c75c0aff08b265ce7c1b9f' 
  AND token = '8XC7C5yFMsxgdI9PbtQ15r5nQlyrXFq3fWv0QdZxhhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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