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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7307f59da614c75a6ade31ff706c5644578123496d9ae7bbaa5396f96df1e7e' 
  AND token = '9pXhh7uV4qHpC05iZRu8Prh43EeuBzZ9zkfbj2PQotI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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