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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a664c424f5c9af8935b99f2fb44a1da406539aa47890cf2758a6df3e00abeb' 
  AND token = '2vhKj3pBku5EflSU0gzeLrQgttqI3IEih42wqziHmgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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