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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd2548371b45d67ea8c3898d779941bce9142d5dc07cfa83faf9ad249970fa1' 
  AND token = 'HHkxQK2qfUSUVc716hxtpOKpljNmLZini4UhC9MF4mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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