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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e82572e545228d97130e045f3f802cd7cb97a4cc08503d28dbf408311f14ac' 
  AND token = 'JPy/BoNC7rrfycz1l10c2fW4xHQbVUGqLul3DlpmTwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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