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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '775b28930d99ebe73af30a595279b05d8fc16f06a0681958c78ae5ecd48dbeeb' 
  AND token = '/JRgilUm00hgAN5+mBUEbIRJ65cizeLd8bLuio9trxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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