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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5860d2eee6ce7107baedec030d708ef293545230e665c14aaf8c2bee98dcca0' 
  AND token = 'Z0CI/1ZJN6Qdm0xAvvTv8grFS8qoFeY6Tds/9rLfBK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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