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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d257cb6304dbe60a057bc43ebde221472d71ef6b6b569a2dffbc44cdc41c1e' 
  AND token = '9JiK30JmSzdw017f/yi9p3J43s77LHPSgR77OmRUNdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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