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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6604b1ac8db65a70a11048dc4fbe8e3557ae4f3115b68b9d31420b531d8b01' 
  AND token = 'uZj0uDO8gYG6PCI6Q+F9fiBCSbB5eVedehGvR1E9xsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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