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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3211e9fc11606e96d8016ec380a38840ab87cff3cb65991ff71589f87bbf68b8' 
  AND token = '0Z9p6lCN19u75LZg5Kw/oxL//KL9ScmbxTR7/TOJF7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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