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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '208735ee55c16f0af975189a2bdf97f784aab72872f39b116ea28446e928c24a' 
  AND token = '4iRxWf0+9jFHY0ex22vdMG1HJH1wjKEakOc8b8FlgMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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