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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3399746f5a0fa77da9164b05a451dabc11cfc41a6ca5d69af3d3254be6cb8d37' 
  AND token = 'hc50MEjfsiGS65SXUezx7Cfi7F4DcJ657rXVkOUp1jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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