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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a23aa0e3fc247ee2e67062cabe685dfba4f3b8133c9ffb2302997509599da2b' 
  AND token = 'yrdmaaq9lId/HWikZ+C64bSNm2MhNAbPrraO/2rI11o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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