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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ee7c761d1afd45ae2028f94e9abdfd1c7c2f9aaf8fd8ae446ae792a3cf43cf' 
  AND token = 'bmVu2LOrGK9phA8LtmHRcTZ9Lprjcbt+C4z/Ggvc094=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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