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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c829dcea3ee17d3c9872ac03e44957b5f73298f413245f197e784fb3f1111f' 
  AND token = '4Cfz0r/n927EXt9lCC4J0YgCvJl2uV8w7VQI8nczyU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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