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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d39b0f24b75ff64ae1ba9a95cd00d827ebab6666f75338d3c2b19d46fe47abf' 
  AND token = 'uDuCsVSVJi1sdI4/4/xyFAld35iQ/G9V8Sjxa6iQi6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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