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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda900bb98710765cc53f5feeca1541754362d14c99d2dcd587409b884077b92' 
  AND token = '0mTL6i3YCsZV0RJbnqJSa8zMyTD8Y+5rT5tFTC2Jg5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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