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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ab7bb00406044f50977205801c4bcae192c9ea0f55bc14ed99b562e8eb5e78' 
  AND token = '48XuUcAKxZfLxXaEDNDpe/H62+n9Zdkk+6SnIj+CtUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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