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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f715d9b31b9958e85dbc4121c2a2975568ccd2db9af3ae2526d0face3739b7' 
  AND token = 'PnjT05SdFiF9YsujWz1NILiL8KF9NKvz/7a5OKb8XqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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