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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '649c90a454cbc6e939765746acd3a21042ce76da6dbce4db4ee6023439206501' 
  AND token = 'Kq00Ys7VNyi1dmQMU8Aodi4mW95liDjnaHiYliXvx0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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