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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e2dc3ac4b788dd7798f46f701d878c77db427542fe258c99d911059a3e3687' 
  AND token = 'cOSQz41zZzI7qVwe+Adw2+oAeHT+IOU/aZD7Bb9Gyfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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