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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ab100e3d62a75b176b0acef9a997b17308fb4923d8c0066f03de29667810ad' 
  AND token = 'FUoDpM9kqJdwQ033CWwdr/8zh/S55HVSMW7LNHjx7kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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