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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace41d3d8df54adaa39668e6d6bfcd50791c5aaf20f25a12e8847434708b0192' 
  AND token = 'XtO9FFtaDs6cmqXE9RyfKGCXah6JVBws3nDONGt8hIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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