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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71fb4fd601cdf6b99a9a047528d89dd59d818d48f308c9a53a546c91613fe146' 
  AND token = 'Vx2PjxZIILxNvVa7G0NH3McqLGm5WicQKn/SwdVE7PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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