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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adec683cb36f57b0656ee1ddf6795a45ccbfbeff5c514eb7a7382eab7a629800' 
  AND token = '3hEG34JZJFVv8ps11QA48sgOJpEb8VpTaf+5LERGl0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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