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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d90f7022ff19c26405a6f9f77376daa242abd5cd36555653ab8fef688abaa87' 
  AND token = '7GOfiAQU6XzAQCSkmX7WvC+0O07apjXRxWiXDOVUY3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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