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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b8750b19b0cf2ddd33fbc4aa12946d1adf988cc9ad755519feb169e4ce34e8' 
  AND token = 'y62J84l4Cq+BhxQiZxVn4tIdQSy63UKuN28ENDXDsuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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