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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36984a64e10f29347d7871c344eb29b6bafd7be8e9ea17a1b6d8f2b0619dc2ac' 
  AND token = 'S342trUwgDawyQUhmXwlKDOnwA55nR55+w0CZU7u+bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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