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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92187b5fac319c882d11cb1182fcbe6ab7f11be9f5be1d8107df36618ffe8e0' 
  AND token = 'j2d/CDRif5jRsESIUGjND5G3/OuVw5arRldONow/7tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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