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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9616263edfde6720c7c1d2466d1756a5fde83fc36fe8cfb4d9617b8fcd497305' 
  AND token = '8Jl5964QTHYeBIYhgbS1Uxnaj85j2qAipOdXQe6jSV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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