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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013e4749e54ef404e6575164897460823075aac73fcfb735d6e4a53505b645fc' 
  AND token = 'OFPyzTub6UwxONNpxOLKnsyAZxUJ8+X+gnnrAQOf1XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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