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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dba10805017fd27e7852431b6ee61d393dc78ac79479230fad73ec0e4c118f9' 
  AND token = '62QAiHMM5gT3Iq04Z6DjDtlDj/QZlkDnjKVjtC460cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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