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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea67017629f9ba149f820a787cf1ab4bd8328a3cd18cce54804fb729d2681d0' 
  AND token = 'bEUMusiEogP/ip9oXaYjw6wTQgm0ADjUylm+Yz1FmOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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