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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10b6d9a469f4cd92a2173e4cec18dd658f8b2b6de792dfeb3f9c5543c2cc5e9' 
  AND token = 'uwG3EAwWD2P+yEp1b2Dynr3M7xTDlbBxt0LRG36SBTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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