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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c255095df27a9aef554672a40cad2e57143be3a70e8f090ff283bac0d87bd6' 
  AND token = 'tgZYpQv4viMY4zE7zv0FXHdB/I/N8Zy1xxoPxjf71lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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