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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d65d36c15fa3bff43223fdd070b637d8cd4cb6c6c6a50580c80fb7a96cfdbc9' 
  AND token = 'DHRlmHvJS0XSnrWzF8yYiOC43ZzEZwu+jSXge68cuJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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