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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0828490d64d9c5dfe0fab4f3ebdaf9db03bf69fa743691c7619ee0b7e11c11' 
  AND token = 't/5/daC32bmzoCAYjHdg5VWqX8NSzBYn6efp/vfaWWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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