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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62bfacebe5039691c4fc08f3146c18415f8b0beb2b914c8a002b2464b5a1e556' 
  AND token = 'IRw99HhslQ2zF3GW8mTjUlTX/nMXfZOhMO0vt0V0SMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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