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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf18086b8559c1b2f7857d7c0906c5be2dd38651733dc3e6a5034a3fbf42ebc6' 
  AND token = '3DB3OlheS6Rjtr+62Hm6P6baQylofqDPZId+sjyog4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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