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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0481748a2c56244923412ae31f6dc61c1c9956c7d01ef99a250723798d15cfb' 
  AND token = 'VbPDmhtYCk/amrLeRJpYfL/5tGtQut9MW/BnSE0AIPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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