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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94857ae5b26bb931b02e95247ecc4155dc40f088afe455a659c33f221a56bd45' 
  AND token = 'LDYWQM8Ywr9qHiGMVYtac0MZH70/Z5HdA/r/x9WCUzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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