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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acab9b5de50e709a36fb75cb80bb6708dd17427787e3c835d5343982705aa03d' 
  AND token = 'QpFb5VAkYjqrKByAARo67ZIk3tjkS6CI9VoyLgIJDpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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