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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22ee5f928f5a9ac46e5b0b0e83ed1862f5f625c04d5bdc1769cd6ca3a95d4835' 
  AND token = 'WActfa8IV92EEY0sfN8d1JHE63wT3JVhsmBfH1KXZJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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