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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cbf5bfd4b38959c0756ef99117899c15f9f9b1429cf9f7cd24cde2d677caf30' 
  AND token = 'RMxSflBSj2rVc7LqME12e9MuAw4VYKWLGGI3FBPy9uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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