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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de03bdf1765bbc7a0f869d4cde0cbf27b659f8efe4720b0d8d6955c7fa12d9a3' 
  AND token = '3K0CLyN+mEZHWZ1Iz8htgL12WDy7yfv5zY8vR5/qXtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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