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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f662081da76d82d36b8765918fb8f231a906ba1a58b1c736841945eb822c97' 
  AND token = '+qRrU60qogb7ZScX5VU6Raolh5qcx3UO9gsIf0P6xnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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