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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033b053d2001f8ad7e45bb1a575957468f23bb619521bee559e9c7068c1677b4' 
  AND token = 'DNnSsZwySyTjevMP17qz0royBLaYHmib+Fs17mf2++M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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