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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2f9443921002559925c21822dd46f6567135dfb9efc95797438e33152de1fb' 
  AND token = 'cXqXURb2OxMsieVTJzh1M6En6BK771eIEaujrdwxAPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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