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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4963b5870f00db4c8a860c5506a6df8b5d9c75926e7dbc4122f1bdb4b6e6281b' 
  AND token = '3o8MASqeAapGN9htb7Zk3llul7Pj10WD/qsHpWVUvAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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