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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e36ba0e1c67c91fc288ad8327a93366d452a14d29a118d9f8da71efd3def0a' 
  AND token = 'oLXmULozjnwXf6Lr8mimzr7c3qmIHAy81+PrXmlm9mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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