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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34cc4422d7e8526e32216ef05d61949e5cb9b4bea4a2d93fbc2e531c3a84b51f' 
  AND token = '8E/iI41Aqeee0fCSQg+KV3QjjK+NHWvurIgh3OCCPiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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