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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b32ace10a4c7fcc7c08febf1519a8c185f831fa183c5acd5bb7fad081e5b19' 
  AND token = 'ln+fkZhRmlj8XcqJuQJlQ7IydSb6DqL5nmOisqTpPYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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