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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f81790cc0a8e85b0bc515d8ac915697b33b9641d75b0fcd308d0ca763b332c' 
  AND token = 'Liiaz/D3SWnbidWuFiDgJNB2lbW39FVqwBDMDu83nxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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