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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96dfda41e0c03b03f6e6d5fc84b49dc596178ad2d1f00dbf049d94bdbe414002' 
  AND token = 'cGz5xfAH7UP1A6PWsDl0BrLZsgb7gQS3veXCGJjqt7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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