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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b5e371f6b03b884c531e1c87449c4801d3c079bb4058a3edb0cab02e0eff18' 
  AND token = 'r6WZGYvKVD8JEveAq15jD9LlydUkzNNgrADyCFNYczQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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