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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9284ef3babb08ace39a5c2b9a280d15d083b8fa9a7e6b05789f61fe288b6af9a' 
  AND token = 'Sfx0Qhrvb4dg7E0bVUCb9ijcbXknIMLQzkptjY2YRpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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