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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d67cb08b3f1f5a97eeb2c5e5afdb14ca2b520f8cd1f9a5d9ecce3488cdbaf22' 
  AND token = '2pR/mNnWoo9HkerGj3JKzU0kO8dUW3ERIJKH8znfjk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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