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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a477a646ffc60008419c53d0a6121ac6dca4e4938d58247692d23224acb89c' 
  AND token = 'OLx6IoqCL5G6EGojfJD0y+x4ypTxkYXmHSxkacwyDV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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