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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa55fce71189f1e8e7ba48a96a91714eafb52acb628907829a130450fe4eee3' 
  AND token = 'fZEHJLEsO76VfnFUSPZFEzVWyoU47Q9doC6BrvM8K/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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