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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584ab84f3a1f00761f7c88546e745c256045e8b1a6e4fbca85473767f0234755' 
  AND token = 'AE8cn7AiewJuBRhChmyNbZhIpKfijGa7SK42u8z+oSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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