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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47edf12d7ee986eff27ea246e654b49caf54ff3f1c53a7ff917c5475df328fbb' 
  AND token = 'NzNLXFn8uRrpFwDrNk5PFn+NW3dpmsaeqt/0E/tHHPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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