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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d327d0fe7427fafb0d0d1789fcecdd9f62eb12d472f64fc3370c60632865c22' 
  AND token = 'RuoZbU7dYJgmfvS03fLgUkRzIf5t91A0uWIB7njos4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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